libs/hwui/renderthread/CacheManager.cpp - LeafOS-Project/android_frameworks_base - Gitiles

 /*
  * Copyright (C) 2017 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include "CacheManager.h"

 #include <GrContextOptions.h>
 #include <GrTypes.h>
 #include <SkExecutor.h>
 #include <SkGraphics.h>
 #include <math.h>
 #include <utils/Trace.h>

 #include <set>

 #include "CanvasContext.h"
 #include "DeviceInfo.h"
 #include "Layer.h"
 #include "Properties.h"
 #include "RenderThread.h"
 #include "VulkanManager.h"
 #include "pipeline/skia/ATraceMemoryDump.h"
 #include "pipeline/skia/ShaderCache.h"
 #include "pipeline/skia/SkiaMemoryTracer.h"
 #include "renderstate/RenderState.h"
 #include "thread/CommonPool.h"

 namespace android {
 namespace uirenderer {
 namespace renderthread {

 CacheManager::CacheManager(RenderThread& thread)
         : mRenderThread(thread), mMemoryPolicy(loadMemoryPolicy()) {
     mMaxSurfaceArea = static_cast<size_t>((DeviceInfo::getWidth() * DeviceInfo::getHeight()) *
                                           mMemoryPolicy.initialMaxSurfaceAreaScale);
     setupCacheLimits();
 }

 static inline int countLeadingZeros(uint32_t mask) {
     // __builtin_clz(0) is undefined, so we have to detect that case.
     return mask ? __builtin_clz(mask) : 32;
 }

 // Return the smallest power-of-2 >= n.
 static inline uint32_t nextPowerOfTwo(uint32_t n) {
     return n ? (1 << (32 - countLeadingZeros(n - 1))) : 1;
 }

 void CacheManager::setupCacheLimits() {
     mMaxResourceBytes = mMaxSurfaceArea * mMemoryPolicy.surfaceSizeMultiplier;
     mBackgroundResourceBytes = mMaxResourceBytes * mMemoryPolicy.backgroundRetentionPercent;
     // This sets the maximum size for a single texture atlas in the GPU font cache. If
     // necessary, the cache can allocate additional textures that are counted against the
     // total cache limits provided to Skia.
     mMaxGpuFontAtlasBytes = nextPowerOfTwo(mMaxSurfaceArea);
     // This sets the maximum size of the CPU font cache to be at least the same size as the
     // total number of GPU font caches (i.e. 4 separate GPU atlases).
     mMaxCpuFontCacheBytes = std::max(mMaxGpuFontAtlasBytes * 4, SkGraphics::GetFontCacheLimit());
     mBackgroundCpuFontCacheBytes = mMaxCpuFontCacheBytes * mMemoryPolicy.backgroundRetentionPercent;

     SkGraphics::SetFontCacheLimit(mMaxCpuFontCacheBytes);
     if (mGrContext) {
         mGrContext->setResourceCacheLimit(mMaxResourceBytes);
     }
 }

 void CacheManager::reset(sk_sp<GrDirectContext> context) {
     if (context != mGrContext) {
         destroy();
     }

     if (context) {
         mGrContext = std::move(context);
         mGrContext->setResourceCacheLimit(mMaxResourceBytes);
         mLastDeferredCleanup = systemTime(CLOCK_MONOTONIC);
     }
 }

 void CacheManager::destroy() {
     // cleanup any caches here as the GrContext is about to go away...
     mGrContext.reset(nullptr);
 }

 class CommonPoolExecutor : public SkExecutor {
 public:
     virtual void add(std::function<void(void)> func) override { CommonPool::post(std::move(func)); }
 };

 static CommonPoolExecutor sDefaultExecutor;

 void CacheManager::configureContext(GrContextOptions* contextOptions, const void* identity,
                                     ssize_t size) {
     contextOptions->fAllowPathMaskCaching = true;
     contextOptions->fGlyphCacheTextureMaximumBytes = mMaxGpuFontAtlasBytes;
     contextOptions->fExecutor = &sDefaultExecutor;

     auto& cache = skiapipeline::ShaderCache::get();
     cache.initShaderDiskCache(identity, size);
     contextOptions->fPersistentCache = &cache;
 }

 static GrPurgeResourceOptions toSkiaEnum(bool scratchOnly) {
     return scratchOnly ? GrPurgeResourceOptions::kScratchResourcesOnly :
                          GrPurgeResourceOptions::kAllResources;
 }

 void CacheManager::trimMemory(TrimLevel mode) {
     if (!mGrContext) {
         return;
     }

     // flush and submit all work to the gpu and wait for it to finish
     mGrContext->flushAndSubmit(GrSyncCpu::kYes);

     switch (mode) {
         case TrimLevel::BACKGROUND:
             mGrContext->freeGpuResources();
             SkGraphics::PurgeAllCaches();
             mRenderThread.destroyRenderingContext();
             break;
         case TrimLevel::UI_HIDDEN:
             // Here we purge all the unlocked scratch resources and then toggle the resources cache
             // limits between the background and max amounts. This causes the unlocked resources
             // that have persistent data to be purged in LRU order.
             mGrContext->setResourceCacheLimit(mBackgroundResourceBytes);
             SkGraphics::SetFontCacheLimit(mBackgroundCpuFontCacheBytes);
             mGrContext->purgeUnlockedResources(toSkiaEnum(mMemoryPolicy.purgeScratchOnly));
             mGrContext->setResourceCacheLimit(mMaxResourceBytes);
             SkGraphics::SetFontCacheLimit(mMaxCpuFontCacheBytes);
             break;
         default:
             break;
     }
 }

 void CacheManager::trimCaches(CacheTrimLevel mode) {
     switch (mode) {
         case CacheTrimLevel::FONT_CACHE:
             SkGraphics::PurgeFontCache();
             break;
         case CacheTrimLevel::RESOURCE_CACHE:
             SkGraphics::PurgeResourceCache();
             break;
         case CacheTrimLevel::ALL_CACHES:
             SkGraphics::PurgeAllCaches();
             if (mGrContext) {
                 mGrContext->purgeUnlockedResources(GrPurgeResourceOptions::kAllResources);
             }
             break;
         default:
             break;
     }
 }

 void CacheManager::trimStaleResources() {
     if (!mGrContext) {
         return;
     }
     mGrContext->flushAndSubmit();
     mGrContext->performDeferredCleanup(std::chrono::seconds(30),
                                        GrPurgeResourceOptions::kAllResources);
 }

 void CacheManager::getMemoryUsage(size_t* cpuUsage, size_t* gpuUsage) {
     *cpuUsage = 0;
     *gpuUsage = 0;
     if (!mGrContext) {
         return;
     }

     skiapipeline::SkiaMemoryTracer cpuTracer("category", true);
     SkGraphics::DumpMemoryStatistics(&cpuTracer);
     *cpuUsage += cpuTracer.total();

     skiapipeline::SkiaMemoryTracer gpuTracer("category", true);
     mGrContext->dumpMemoryStatistics(&gpuTracer);
     *gpuUsage += gpuTracer.total();
 }

 void CacheManager::dumpMemoryUsage(String8& log, const RenderState* renderState) {
     log.appendFormat(R"(Memory policy:
   Max surface area: %zu
   Max resource usage: %.2fMB (x%.0f)
   Background retention: %.0f%% (altUiHidden = %s)
 )",
                      mMaxSurfaceArea, mMaxResourceBytes / 1000000.f,
                      mMemoryPolicy.surfaceSizeMultiplier,
                      mMemoryPolicy.backgroundRetentionPercent * 100.0f,
                      mMemoryPolicy.useAlternativeUiHidden ? "true" : "false");
     if (Properties::isSystemOrPersistent) {
         log.appendFormat("  IsSystemOrPersistent\n");
     }
     log.appendFormat("  GPU Context timeout: %" PRIu64 "\n", ns2s(mMemoryPolicy.contextTimeout));
     size_t stoppedContexts = 0;
     for (auto context : mCanvasContexts) {
         if (context->isStopped()) stoppedContexts++;
     }
     log.appendFormat("Contexts: %zu (stopped = %zu)\n", mCanvasContexts.size(), stoppedContexts);

     auto vkInstance = VulkanManager::peekInstance();
     if (!mGrContext) {
         if (!vkInstance) {
             log.appendFormat("No GPU context.\n");
         } else {
             log.appendFormat("No GrContext; however %d remaining Vulkan refs",
                              vkInstance->getStrongCount() - 1);
         }
         return;
     }
     std::vector<skiapipeline::ResourcePair> cpuResourceMap = {
             {"skia/sk_resource_cache/bitmap_", "Bitmaps"},
             {"skia/sk_resource_cache/rrect-blur_", "Masks"},
             {"skia/sk_resource_cache/rects-blur_", "Masks"},
             {"skia/sk_resource_cache/tessellated", "Shadows"},
             {"skia/sk_glyph_cache", "Glyph Cache"},
     };
     skiapipeline::SkiaMemoryTracer cpuTracer(cpuResourceMap, false);
     SkGraphics::DumpMemoryStatistics(&cpuTracer);
     if (cpuTracer.hasOutput()) {
         log.appendFormat("CPU Caches:\n");
         cpuTracer.logOutput(log);
         log.appendFormat("  Glyph Count: %d \n", SkGraphics::GetFontCacheCountUsed());
         log.appendFormat("Total CPU memory usage:\n");
         cpuTracer.logTotals(log);
     }

     skiapipeline::SkiaMemoryTracer gpuTracer("category", true);
     mGrContext->dumpMemoryStatistics(&gpuTracer);
     if (gpuTracer.hasOutput()) {
         log.appendFormat("GPU Caches:\n");
         gpuTracer.logOutput(log);
     }

     if (renderState && renderState->mActiveLayers.size() > 0) {
         log.appendFormat("Layer Info:\n");

         const char* layerType = Properties::getRenderPipelineType() == RenderPipelineType::SkiaGL
                                         ? "GlLayer"
                                         : "VkLayer";
         size_t layerMemoryTotal = 0;
         for (std::set<Layer*>::iterator it = renderState->mActiveLayers.begin();
              it != renderState->mActiveLayers.end(); it++) {
             const Layer* layer = *it;
             log.appendFormat("    %s size %dx%d\n", layerType, layer->getWidth(),
                              layer->getHeight());
             layerMemoryTotal += layer->getWidth() * layer->getHeight() * 4;
         }
         log.appendFormat("  Layers Total         %6.2f KB (numLayers = %zu)\n",
                          layerMemoryTotal / 1024.0f, renderState->mActiveLayers.size());
     }

     log.appendFormat("Total GPU memory usage:\n");
     gpuTracer.logTotals(log);
 }

 void CacheManager::onFrameCompleted() {
     cancelDestroyContext();
     mFrameCompletions.next() = systemTime(CLOCK_MONOTONIC);
     if (ATRACE_ENABLED()) {
         ATRACE_NAME("dumpingMemoryStatistics");
         static skiapipeline::ATraceMemoryDump tracer;
         tracer.startFrame();
         SkGraphics::DumpMemoryStatistics(&tracer);
         if (mGrContext && Properties::debugTraceGpuResourceCategories) {
             mGrContext->dumpMemoryStatistics(&tracer);
         }
         tracer.logTraces(Properties::debugTraceGpuResourceCategories, mGrContext.get());
     }
 }

 void CacheManager::onThreadIdle() {
     if (!mGrContext || mFrameCompletions.size() == 0) return;

     const nsecs_t now = systemTime(CLOCK_MONOTONIC);
     // Rate limiting
     if ((now - mLastDeferredCleanup) > 25_ms) {
         mLastDeferredCleanup = now;
         const nsecs_t frameCompleteNanos = mFrameCompletions[0];
         const nsecs_t frameDiffNanos = now - frameCompleteNanos;
         const nsecs_t cleanupMillis =
                 ns2ms(std::clamp(frameDiffNanos, mMemoryPolicy.minimumResourceRetention,
                                  mMemoryPolicy.maximumResourceRetention));
         mGrContext->performDeferredCleanup(std::chrono::milliseconds(cleanupMillis),
                                            toSkiaEnum(mMemoryPolicy.purgeScratchOnly));
     }
 }

 void CacheManager::scheduleDestroyContext() {
     if (mMemoryPolicy.contextTimeout > 0) {
         mRenderThread.queue().postDelayed(mMemoryPolicy.contextTimeout,
                                           [this, genId = mGenerationId] {
                                               if (mGenerationId != genId) return;
                                               // GenID should have already stopped this, but just in
                                               // case
                                               if (!areAllContextsStopped()) return;
                                               mRenderThread.destroyRenderingContext();
                                           });
     }
 }

 void CacheManager::cancelDestroyContext() {
     if (mIsDestructionPending) {
         mIsDestructionPending = false;
         mGenerationId++;
     }
 }

 bool CacheManager::areAllContextsStopped() {
     for (auto context : mCanvasContexts) {
         if (!context->isStopped()) return false;
     }
     return true;
 }

 void CacheManager::checkUiHidden() {
     if (!mGrContext) return;

     if (mMemoryPolicy.useAlternativeUiHidden && areAllContextsStopped()) {
         trimMemory(TrimLevel::UI_HIDDEN);
     }
 }

 void CacheManager::registerCanvasContext(CanvasContext* context) {
     mCanvasContexts.push_back(context);
     cancelDestroyContext();
 }

 void CacheManager::unregisterCanvasContext(CanvasContext* context) {
     std::erase(mCanvasContexts, context);
     checkUiHidden();
     if (mCanvasContexts.empty()) {
         scheduleDestroyContext();
     }
 }

 void CacheManager::onContextStopped(CanvasContext* context) {
     checkUiHidden();
     if (mMemoryPolicy.releaseContextOnStoppedOnly && areAllContextsStopped()) {
         scheduleDestroyContext();
     }
 }

 void CacheManager::notifyNextFrameSize(int width, int height) {
     int frameArea = width * height;
     if (frameArea > mMaxSurfaceArea) {
         mMaxSurfaceArea = frameArea;
         setupCacheLimits();
     }
 }

 } /* namespace renderthread */
 } /* namespace uirenderer */
 } /* namespace android */
	/*
	* Copyright (C) 2017 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include "CacheManager.h"

	#include <GrContextOptions.h>
	#include <GrTypes.h>
	#include <SkExecutor.h>
	#include <SkGraphics.h>
	#include <math.h>
	#include <utils/Trace.h>

	#include <set>

	#include "CanvasContext.h"
	#include "DeviceInfo.h"
	#include "Layer.h"
	#include "Properties.h"
	#include "RenderThread.h"
	#include "VulkanManager.h"
	#include "pipeline/skia/ATraceMemoryDump.h"
	#include "pipeline/skia/ShaderCache.h"
	#include "pipeline/skia/SkiaMemoryTracer.h"
	#include "renderstate/RenderState.h"
	#include "thread/CommonPool.h"

	namespace android {
	namespace uirenderer {
	namespace renderthread {

	CacheManager::CacheManager(RenderThread& thread)
	: mRenderThread(thread), mMemoryPolicy(loadMemoryPolicy()) {
	mMaxSurfaceArea = static_cast<size_t>((DeviceInfo::getWidth() * DeviceInfo::getHeight()) *
	mMemoryPolicy.initialMaxSurfaceAreaScale);
	setupCacheLimits();
	}

	static inline int countLeadingZeros(uint32_t mask) {
	// __builtin_clz(0) is undefined, so we have to detect that case.
	return mask ? __builtin_clz(mask) : 32;
	}

	// Return the smallest power-of-2 >= n.
	static inline uint32_t nextPowerOfTwo(uint32_t n) {
	return n ? (1 << (32 - countLeadingZeros(n - 1))) : 1;
	}

	void CacheManager::setupCacheLimits() {
	mMaxResourceBytes = mMaxSurfaceArea * mMemoryPolicy.surfaceSizeMultiplier;
	mBackgroundResourceBytes = mMaxResourceBytes * mMemoryPolicy.backgroundRetentionPercent;
	// This sets the maximum size for a single texture atlas in the GPU font cache. If
	// necessary, the cache can allocate additional textures that are counted against the
	// total cache limits provided to Skia.
	mMaxGpuFontAtlasBytes = nextPowerOfTwo(mMaxSurfaceArea);
	// This sets the maximum size of the CPU font cache to be at least the same size as the
	// total number of GPU font caches (i.e. 4 separate GPU atlases).
	mMaxCpuFontCacheBytes = std::max(mMaxGpuFontAtlasBytes * 4, SkGraphics::GetFontCacheLimit());
	mBackgroundCpuFontCacheBytes = mMaxCpuFontCacheBytes * mMemoryPolicy.backgroundRetentionPercent;

	SkGraphics::SetFontCacheLimit(mMaxCpuFontCacheBytes);
	if (mGrContext) {
	mGrContext->setResourceCacheLimit(mMaxResourceBytes);
	}
	}

	void CacheManager::reset(sk_sp<GrDirectContext> context) {
	if (context != mGrContext) {
	destroy();
	}

	if (context) {
	mGrContext = std::move(context);
	mGrContext->setResourceCacheLimit(mMaxResourceBytes);
	mLastDeferredCleanup = systemTime(CLOCK_MONOTONIC);
	}
	}

	void CacheManager::destroy() {
	// cleanup any caches here as the GrContext is about to go away...
	mGrContext.reset(nullptr);
	}

	class CommonPoolExecutor : public SkExecutor {
	public:
	virtual void add(std::function<void(void)> func) override { CommonPool::post(std::move(func)); }
	};

	static CommonPoolExecutor sDefaultExecutor;

	void CacheManager::configureContext(GrContextOptions* contextOptions, const void* identity,
	ssize_t size) {
	contextOptions->fAllowPathMaskCaching = true;
	contextOptions->fGlyphCacheTextureMaximumBytes = mMaxGpuFontAtlasBytes;
	contextOptions->fExecutor = &sDefaultExecutor;

	auto& cache = skiapipeline::ShaderCache::get();
	cache.initShaderDiskCache(identity, size);
	contextOptions->fPersistentCache = &cache;
	}

	static GrPurgeResourceOptions toSkiaEnum(bool scratchOnly) {
	return scratchOnly ? GrPurgeResourceOptions::kScratchResourcesOnly :
	GrPurgeResourceOptions::kAllResources;
	}

	void CacheManager::trimMemory(TrimLevel mode) {
	if (!mGrContext) {
	return;
	}

	// flush and submit all work to the gpu and wait for it to finish
	mGrContext->flushAndSubmit(GrSyncCpu::kYes);

	switch (mode) {
	case TrimLevel::BACKGROUND:
	mGrContext->freeGpuResources();
	SkGraphics::PurgeAllCaches();
	mRenderThread.destroyRenderingContext();
	break;
	case TrimLevel::UI_HIDDEN:
	// Here we purge all the unlocked scratch resources and then toggle the resources cache
	// limits between the background and max amounts. This causes the unlocked resources
	// that have persistent data to be purged in LRU order.
	mGrContext->setResourceCacheLimit(mBackgroundResourceBytes);
	SkGraphics::SetFontCacheLimit(mBackgroundCpuFontCacheBytes);
	mGrContext->purgeUnlockedResources(toSkiaEnum(mMemoryPolicy.purgeScratchOnly));
	mGrContext->setResourceCacheLimit(mMaxResourceBytes);
	SkGraphics::SetFontCacheLimit(mMaxCpuFontCacheBytes);
	break;
	default:
	break;
	}
	}

	void CacheManager::trimCaches(CacheTrimLevel mode) {
	switch (mode) {
	case CacheTrimLevel::FONT_CACHE:
	SkGraphics::PurgeFontCache();
	break;
	case CacheTrimLevel::RESOURCE_CACHE:
	SkGraphics::PurgeResourceCache();
	break;
	case CacheTrimLevel::ALL_CACHES:
	SkGraphics::PurgeAllCaches();
	if (mGrContext) {
	mGrContext->purgeUnlockedResources(GrPurgeResourceOptions::kAllResources);
	}
	break;
	default:
	break;
	}
	}

	void CacheManager::trimStaleResources() {
	if (!mGrContext) {
	return;
	}
	mGrContext->flushAndSubmit();
	mGrContext->performDeferredCleanup(std::chrono::seconds(30),
	GrPurgeResourceOptions::kAllResources);
	}

	void CacheManager::getMemoryUsage(size_t* cpuUsage, size_t* gpuUsage) {
	*cpuUsage = 0;
	*gpuUsage = 0;
	if (!mGrContext) {
	return;
	}

	skiapipeline::SkiaMemoryTracer cpuTracer("category", true);
	SkGraphics::DumpMemoryStatistics(&cpuTracer);
	*cpuUsage += cpuTracer.total();

	skiapipeline::SkiaMemoryTracer gpuTracer("category", true);
	mGrContext->dumpMemoryStatistics(&gpuTracer);
	*gpuUsage += gpuTracer.total();
	}

	void CacheManager::dumpMemoryUsage(String8& log, const RenderState* renderState) {
	log.appendFormat(R"(Memory policy:
	Max surface area: %zu
	Max resource usage: %.2fMB (x%.0f)
	Background retention: %.0f%% (altUiHidden = %s)
	)",
	mMaxSurfaceArea, mMaxResourceBytes / 1000000.f,
	mMemoryPolicy.surfaceSizeMultiplier,
	mMemoryPolicy.backgroundRetentionPercent * 100.0f,
	mMemoryPolicy.useAlternativeUiHidden ? "true" : "false");
	if (Properties::isSystemOrPersistent) {
	log.appendFormat(" IsSystemOrPersistent\n");
	}
	log.appendFormat(" GPU Context timeout: %" PRIu64 "\n", ns2s(mMemoryPolicy.contextTimeout));
	size_t stoppedContexts = 0;
	for (auto context : mCanvasContexts) {
	if (context->isStopped()) stoppedContexts++;
	}
	log.appendFormat("Contexts: %zu (stopped = %zu)\n", mCanvasContexts.size(), stoppedContexts);

	auto vkInstance = VulkanManager::peekInstance();
	if (!mGrContext) {
	if (!vkInstance) {
	log.appendFormat("No GPU context.\n");
	} else {
	log.appendFormat("No GrContext; however %d remaining Vulkan refs",
	vkInstance->getStrongCount() - 1);
	}
	return;
	}
	std::vector<skiapipeline::ResourcePair> cpuResourceMap = {
	{"skia/sk_resource_cache/bitmap_", "Bitmaps"},
	{"skia/sk_resource_cache/rrect-blur_", "Masks"},
	{"skia/sk_resource_cache/rects-blur_", "Masks"},
	{"skia/sk_resource_cache/tessellated", "Shadows"},
	{"skia/sk_glyph_cache", "Glyph Cache"},
	};
	skiapipeline::SkiaMemoryTracer cpuTracer(cpuResourceMap, false);
	SkGraphics::DumpMemoryStatistics(&cpuTracer);
	if (cpuTracer.hasOutput()) {
	log.appendFormat("CPU Caches:\n");
	cpuTracer.logOutput(log);
	log.appendFormat(" Glyph Count: %d \n", SkGraphics::GetFontCacheCountUsed());
	log.appendFormat("Total CPU memory usage:\n");
	cpuTracer.logTotals(log);
	}

	skiapipeline::SkiaMemoryTracer gpuTracer("category", true);
	mGrContext->dumpMemoryStatistics(&gpuTracer);
	if (gpuTracer.hasOutput()) {
	log.appendFormat("GPU Caches:\n");
	gpuTracer.logOutput(log);
	}

	if (renderState && renderState->mActiveLayers.size() > 0) {
	log.appendFormat("Layer Info:\n");

	const char* layerType = Properties::getRenderPipelineType() == RenderPipelineType::SkiaGL
	? "GlLayer"
	: "VkLayer";
	size_t layerMemoryTotal = 0;
	for (std::set<Layer*>::iterator it = renderState->mActiveLayers.begin();
	it != renderState->mActiveLayers.end(); it++) {
	const Layer* layer = *it;
	log.appendFormat(" %s size %dx%d\n", layerType, layer->getWidth(),
	layer->getHeight());
	layerMemoryTotal += layer->getWidth() * layer->getHeight() * 4;
	}
	log.appendFormat(" Layers Total %6.2f KB (numLayers = %zu)\n",
	layerMemoryTotal / 1024.0f, renderState->mActiveLayers.size());
	}

	log.appendFormat("Total GPU memory usage:\n");
	gpuTracer.logTotals(log);
	}

	void CacheManager::onFrameCompleted() {
	cancelDestroyContext();
	mFrameCompletions.next() = systemTime(CLOCK_MONOTONIC);
	if (ATRACE_ENABLED()) {
	ATRACE_NAME("dumpingMemoryStatistics");
	static skiapipeline::ATraceMemoryDump tracer;
	tracer.startFrame();
	SkGraphics::DumpMemoryStatistics(&tracer);
	if (mGrContext && Properties::debugTraceGpuResourceCategories) {
	mGrContext->dumpMemoryStatistics(&tracer);
	}
	tracer.logTraces(Properties::debugTraceGpuResourceCategories, mGrContext.get());
	}
	}

	void CacheManager::onThreadIdle() {
	if (!mGrContext \|\| mFrameCompletions.size() == 0) return;

	const nsecs_t now = systemTime(CLOCK_MONOTONIC);
	// Rate limiting
	if ((now - mLastDeferredCleanup) > 25_ms) {
	mLastDeferredCleanup = now;
	const nsecs_t frameCompleteNanos = mFrameCompletions[0];
	const nsecs_t frameDiffNanos = now - frameCompleteNanos;
	const nsecs_t cleanupMillis =
	ns2ms(std::clamp(frameDiffNanos, mMemoryPolicy.minimumResourceRetention,
	mMemoryPolicy.maximumResourceRetention));
	mGrContext->performDeferredCleanup(std::chrono::milliseconds(cleanupMillis),
	toSkiaEnum(mMemoryPolicy.purgeScratchOnly));
	}
	}

	void CacheManager::scheduleDestroyContext() {
	if (mMemoryPolicy.contextTimeout > 0) {
	mRenderThread.queue().postDelayed(mMemoryPolicy.contextTimeout,
	[this, genId = mGenerationId] {
	if (mGenerationId != genId) return;
	// GenID should have already stopped this, but just in
	// case
	if (!areAllContextsStopped()) return;
	mRenderThread.destroyRenderingContext();
	});
	}
	}

	void CacheManager::cancelDestroyContext() {
	if (mIsDestructionPending) {
	mIsDestructionPending = false;
	mGenerationId++;
	}
	}

	bool CacheManager::areAllContextsStopped() {
	for (auto context : mCanvasContexts) {
	if (!context->isStopped()) return false;
	}
	return true;
	}

	void CacheManager::checkUiHidden() {
	if (!mGrContext) return;

	if (mMemoryPolicy.useAlternativeUiHidden && areAllContextsStopped()) {
	trimMemory(TrimLevel::UI_HIDDEN);
	}
	}

	void CacheManager::registerCanvasContext(CanvasContext* context) {
	mCanvasContexts.push_back(context);
	cancelDestroyContext();
	}

	void CacheManager::unregisterCanvasContext(CanvasContext* context) {
	std::erase(mCanvasContexts, context);
	checkUiHidden();
	if (mCanvasContexts.empty()) {
	scheduleDestroyContext();
	}
	}

	void CacheManager::onContextStopped(CanvasContext* context) {
	checkUiHidden();
	if (mMemoryPolicy.releaseContextOnStoppedOnly && areAllContextsStopped()) {
	scheduleDestroyContext();
	}
	}

	void CacheManager::notifyNextFrameSize(int width, int height) {
	int frameArea = width * height;
	if (frameArea > mMaxSurfaceArea) {
	mMaxSurfaceArea = frameArea;
	setupCacheLimits();
	}
	}

	} /* namespace renderthread */
	} /* namespace uirenderer */
	} /* namespace android */